---
id: 64ddd65848a12919d7e1c7d0
title: ステップ 31
challengeType: 20
dashedName: step-31
---

# --description--

It's time to move some code from the `move()` function to the `make_allowed_move()` function. Move the code nested inside the first `if` statement (except the first `print()` call) to your new function. Pay close attention to the indentation. Don't forget to remove the `pass` keyword.

# --hints--

You should move the code nested inside the first `if` statement (except the first `print()` call) to your new function.

```js
({ test: () => {
  assert.match(code, /def\s+make_allowed_move\(\s*rod1\s*,\s*rod2\s*\):\s+forward\s*=\s*False\s+if\s+not\s+rods\s*\[\s*target\s*\]\s*:\s+forward\s*=\s*True\s+elif\s+rods\s*\[\s*source\s*\]\s+and\s+rods\s*\[\s*source\s*\]\s*\[\s*-1\s*\]\s*<\s*rods\s*\[\s*target\s*\]\s*\[\s*-\s*1\s*\]\s*:\s+forward\s*=\s*True\s+if\s+forward\s*:\s+print\(\s*f'Moving\sdisk\s\{\s*rods\s*\[\s*source\s*\]\s*\[\s*-\s*1\s*\]\s*\}\sfrom\s\{\s*source\s*\}\sto\s\{\s*target\s*\}'\s*\)\s+rods\s*\[\s*target\s*\]\s*\.append\(\s*rods\s*\[\s*source\s*\]\s*\.pop\(\s*\)\s*\)\s+else\s*:\s+print\(\s*f'Moving\sdisk\s\{\s*rods\s*\[\s*target\s*\]\s*\[\s*-\s*1\s*\]\s*\}\sfrom\s\{\s*target\s*\}\sto\s\{\s*source\s*\}'\s*\)\s+rods\s*\[\s*source\s*\]\s*\.append\(\s*rods\s*\[\s*target\s*\]\s*\.pop\(\s*\)\s*\)\s+#\s*display\sour\sprogress\s+print\(\s*rods\s*\)/);
  }
})
```

# --seed--

## --seed-contents--

```py
NUMBER_OF_DISKS = 3
number_of_moves = 2**NUMBER_OF_DISKS - 1
rods = {
    'A': list(range(NUMBER_OF_DISKS, 0, -1)),
    'B': [],
    'C': []
}
--fcc-editable-region--
def make_allowed_move(rod1, rod2):
    pass

def move(n, source, auxiliary, target):
    # display starting configuration
    print(rods)
    for i in range(number_of_moves):
        remainder = (i + 1) % 3
        if remainder == 1:
            print(f'Move {i + 1} allowed between {source} and {target}')
            forward = False
            if not rods[target]:
                forward = True
            elif rods[source] and rods[source][-1] < rods[target][-1]:
                forward = True
            if forward:
                print(f'Moving disk {rods[source][-1]} from {source} to {target}')
                rods[target].append(rods[source].pop())
            else:
                print(f'Moving disk {rods[target][-1]} from {target} to {source}')
                rods[source].append(rods[target].pop())

            # display our progress
            print(rods)
--fcc-editable-region--
        elif remainder == 2:
            print(f'Move {i + 1} allowed between {source} and {auxiliary}')
        elif remainder == 0:
            print(f'Move {i + 1} allowed between {auxiliary} and {target}')

# initiate call from source A to target C with auxiliary B
move(NUMBER_OF_DISKS, 'A', 'B', 'C')
```
